JavaScript:使用数组存储一组字符串,统计其中包含"a"或"A"的字符串的个数

var arr = ["America","Greece", "Britain", "Canade", "China", "Egypt"];
var count = 0;

for(var i in arr) {
  if (arr[i].indexOf("a") != -1 || arr[i].indexOf("A") != -1) {
      count++
  }
}    

alert(count); // 4

原文：https://www.cnblogs.com/qjuly/p/13258438.html